Transcription

1 Big News! Dick Kline Inventor of the KF AirFoil Contacts rcfoamfighters. (Copy of from Dick Kline to rcfoamfighters on 3/28/09) Hi Frank and Paul... You both are more than welcome to do a video of the KF airfoil. I'm delighted that you are interested in this concept that has been trashed by the experts for over forty years. They claim that it is too high in drag. However, when the step is applied to a flat plate it appears to go faster. The KFm4 goes even faster than the other KFm variations. When a KF step was applied to the end of a prop it increased the thrust by almost 9%. If the step produces too much drag, how can it become more efficient. Personally, and I'm no expert, but I believe that 50% of the KFm4 produces no direct friction or drag because it is air against air. That's kind of mindblowing to think that half of the airfoil doesn't come in direct contact with the air around it. Have you guys ever heard of the Kamm effect? In the 1930s, Wunibald Kamm who was a German aerodynamicist, chopped off the rear end of his racing car. At that time it was thought that the tear-drop shape was the most aerodynamic. The blunted rear end proved to be more aerodynamically efficient, which is why most cars today come with blunted rear ends. That includes the hybrids, which are looking for fuel economy. In fact, the Boxfish has inspired blunted rear end designs. Here is one study done in 1998 that shows some positive characteristics of the step concept. Finally... Here is a list of the positive characteristics that the KF airfoil has shown to date: 1. The KF airfoil handles a wide range of speed from very slow to very fast. 2. Normal airfoils are designed to either generate a lot of lift in order to carry more weight, which means they must be thicker to produce more lift, or they need to be thinner in order to fly faster thus sacrificing lifting heavier loads. The KF airfoil can do both of these jobs extremely well. 3. The KF airfoil has a much greater range for its center of gravity (CG). A conventional airfoil would normally have a CG about 33% back. The KF airfoil can be moved back as much as 40%, thus allowing it to carry a heavier load. The further back the center of gravity is the more desirable it is because of the center of balance. And, it can also handle a shifting CG and still give you control authority. 4. The KF airfoil has great control authority. It's control surfaces remain effective through a large range of angle of attack (AOA). Even beyond a 60º

2 AOA. This is also evident by its ability to have a very fast roll rate with full aileron and rudder control at very high angles of attack. 5. Normally, all flying wings require some reflex in flight. Reflex, which will produce some drag, means that the ailerons are angled upwards slightly in order to keep the nose of the aircraft pointed up. It is also well known that flying wings are extremely unstable and stall easily in flight. The KF airfoil requires zero degrees reflex on a flying wing which means no drag from the reflex action. It is a very stable platform. It is capable of flying without stabilizers or rudder, which means that two components which cause drag are eliminated. 6. The KF airfoil appears to have better air penetration. High winds seem to have little effect on how it performs. People have reported not being able to fly their aircraft during strong wind periods while the KF airfoil continues to fly smoothly. It appears as if it rides on rails. 7. In addition, the KF airfoil doesn't appear to be affected by weight increases. It has been reported that the handling of the aircraft doesn't seem to be affected by adding additional weight. In one case, 4.5 oz. of lead was added and it was able to handle the added weight with ease. In another case, a KF glider which was facing 22 mph wind, flew very well when nearly 100% lead weight was added to it. 8. At high angles of attack, the KF airfoil remains unstallable. The center of gravity and center of pressure appear to move backward thus preventing a loss of lift. 9. The possibility exists that the KF airfoil may be more fuel efficient because one quarter of the airfoil produces little friction due to the trapped vortex pitting air against air. A normal airfoil produces friction over the entire surface. 10. Unmanned aerial vehicles are extremely expensive aircraft. The loss rate in the military is rather high over 20%. The KF airfoil is a minimal structure which is very strong and simple to build. It would greatly improve on the survivability of these planes because of all the reasons outlined above. In addition, because it penetrates the air so well and is extremely stable, it will produce better photography. Because of a better center of gravity, it will be able to carry more weight, either extra cameras or extra batteries for longer flights. And, because of its ability to penetrate air better, it is not affected as much by higher wind gusts. It has been shown to fly in strong winds when all other RC aircraft were grounded. And, now for the most amazing aspect of all... the KF airfoil has no apparent bad habits, vices or negatives that have shown up. All airfoils have their positives and their negatives, because each one is designed to do a specific job. Thus, a given airfoil can do certain things well, but do poorly in other areas. To date, nothing negative has appeared on the KF airfoil. The concept behind the Kline-Fogleman airfoil may be hard to understand because it is so different from present aerodynamics. The KF concept uses a vortex, which attaches itself to the KF airfoil behind the step and becomes part of the airfoil. This means that one-quarter of the KF airfoil is air against air. This also means less friction and greater efficiency penetrating the air. It is important that the step be between 7% and 9% at 50% of the chord on top. When the step is on the bottom, the step should be at 40% of the chord. When the step is

3 on top, it will produce higher lift than on the bottom, but the airfoil works well right side up or upside down. With the KFm4 airfoil, which has the step on the top and bottom, 50% of this airfoil is air against air, which means no direct friction or drag. Dick Kline P.S. I'd be very interested in your own personal experiences with the KF airfoil concept. I think that there may be a difference between what is seen or studied in lab conditions is not the same as what happens in the real world. So many people who first see the KF airfoil react to it by saying, "That thing can't fly." Somehow it does inspite of everything that we have learned about the way a wing is supposed to generate lift. Thanks again, guys, for your interest

GLIDER BASICS WHAT IS GLIDER? A light engineless aircraft designed to glide after being towed aloft or launched from a catapult. 2 PARTS OF GLIDER A glider can be divided into three main parts: a)fuselage

PRE-TEST Module 2 The Principles of Flight Units 1-2-3.../60 points 1 Answer the following questions. (20 p.) moving the plane (4) upward / forward. Opposed to that is 1. What are the names of the four

Uncontrolled copy not subject to amendment Principles of Flight Principles of Flight Learning Outcome 1: Know the principles of lift, weight, thrust and drag and how a balance of forces affects an aeroplane

Flying Wings By Henry Cole FLYING WINGS REPRESENT THE THEORETICAL ULTIMATE IN AIRCRAFT DESIGN. USE THESE IDEAS, AVAILABLE AFTER A YEAR, OF RESEARCH, TO DEVELOP PRACTICAL MODELS. The rubber version of this

CIRCLING THE HOLIGHAUS WAY - OR DO YOU REALLY WANT TO KEEP THE YAW STRING CENTERED? BY RICHARD H. JOHNSON ANSWERS: 1. During Straight Flight - YES, that minimizes drag and maximizes the sailplane's performance.

Flight Corridor The speed-altitude band where flight sustained by aerodynamic forces is technically possible is called the flight corridor. The subsonic Boeing 747 and supersonic Concorde have flight corridors

Flight Control Systems Introduction Dr Slide 1 Flight Control System A Flight Control System (FCS) consists of the flight control surfaces, the respective cockpit controls, connecting linkage, and necessary

Spins and how to keep the pointy end of the airplane going forward 8/14/07 Evan Reed, cfievan@yahoo.com Ed Williams Outline Spins and their general characteristics Accident statistics and scenarios Some

Fighter aircraft design Aerospace Design Project 2017-2018 G. Dimitriadis General configuration The elements of the general configuration are the following: Wing Wing placement Airfoil Number of engines

Homework Exercise to prepare for Class #2. Answer these on notebook paper then correct or improve your answers (using another color) by referring to the answer sheet. 1. Identify the major components depicted

My Background Flying RC sailplanes since 1976 First competition 1977 US Nationals, placed 2 nd Only pilot to win world champion for both FAI recognized soaring disciplines FAI world record holder for declared

The Definite Guide to Optimist Trim by Martin Gahmberg & the WB-Sails team The purpose of this tuning guide is to help you trim your WB sail optimally by learning the effects of the controls: How to change

AIRCRAFT STRUCTURAL DESIGN & ANALYSIS K. RAMAJEYATHILAGAM To invent an airplane is nothing To build one is something But to fly is everything Lilienthal DAY 1 WHAT IS AN AIRCRAFT? An aircraft is a vehicle,

Building Good Habits for a Better Future Aileron-Rudder Mixing Explained By Dave Scott. Instructor, 1st U.S. R/C Flight School Illustrations by Dave Scott Adverse Yaw Introduction The following article

A ifferent Approach to Teaching Engine-Out Glides es Glatt, Ph., ATP/CFI-AI, AGI/IGI When student pilots begin to learn about emergency procedures, the concept of the engine-out glide is introduced. The

Stalls and Spins Tom Johnson CFIG Do we need all of this? Lift The force created by moving the wing through the air. Angle of Attack: The angle between the relative wind and the wing chord line. Stalls

Slide 1 BASIC AIRCRAFT STRUCTURES The basic aircraft structure serves multiple purposes. Such as aircraft aerodynamics; which indicates how smooth the aircraft flies thru the air (The Skelton of the aircraft

V mca (and the conditions that affect it) V mca, the minimum airspeed at which an airborne multiengine airplane is controllable with an inoperative engine under a standard set of conditions, is arguably

Aircraft flight control systems are classified as primary and secondary. The primary control systems consist of those that are required to safely control an airplane during flight. These include the ailerons,

SLEs Properties of Air o has pressure o has mass o composition of air Recipe for air Login to Learn Alberta site Click on Grade 6 Click on science Click on The Thrill of Flight Topic 2 What is Air?, Lesson

Lift for a Finite Wing all real wings are finite in span (airfoils are considered as infinite in the span) The lift coefficient differs from that of an airfoil because there are strong vortices produced

From the Library at www.uavgroundschool.com Chapter 4 Principles of Flight Introduction This chapter examines the fundamental physical laws governing the forces acting on an aircraft in flight, and what

Aerodynamics In this packet, we will be learning the basic physics behind how air balloons, airships, and airplanes fly! We are then going to practice these principles in easy and fun activities that can

HIGH ALTITUDE AERODYNAMICS CRITICAL ASPECTS OF MACH FLIGHT In recent years, a number of corporate jet airplanes have been involved in catastrophic loss of control during high-altitude/high-speed flight.

The Society thanks you for the report on the success of the 1902 Glider. They are also following the progress of Samuel Langley s flying research. Langley had successfully flown a steam-powered aircraft

Four forces on an airplane By NASA.gov on 10.12.16 Word Count 824 Level MAX TOP: An airplane pictured on June 30, 2016. Courtesy of Pexels. BOTTOM: Four forces on an airplane. Courtesy of NASA. A force

Landing Events Penalties General Judges should use airport diagrams, satellite pictures or other means to determine, as accurately as possible, assessments of landing pattern penalties. Judges should be

Page 1 of 7 Lesson 2: Turns How Airplanes Turn Fly This Lesson Now by Rod Machado There are many misconceptions in aviation. For instance, there are pilots who think propwash is a highly specialized detergent.

Original idea from Captain A. Wagner T TAKEOFF & LANDING IN ICING CONDITIONS here have been a number of accidents related to take-off in conditions in which snow and/or other forms of freezing precipitation

THE SUP GUIDE By: Robert Stehlik, founder and CEO of Blue Planet Surf Helping You Choose the Right SUP Board Aloha SUP ers and mahalo for dropping in with Blue Planet Surf! One of the most frequent inquiries

ATPL Principles of Flight - deel 2 1. If flaps are deployed at constant IAS in straight and level flight, the magnitude of tip vortices will eventually: (flap span less then wing span) A decrease B remain

42 Ball Trajectories Factors Influencing the Flight of the Ball Nathalie Tauziat, France By Rod Cross Introduction Agood tennis player knows instinctively how hard to hit a ball and at what angle to get

THE RUDDER starting from the requirements supplied by the customer, the designer must obtain the rudder's characteristics that satisfy such requirements. Subsequently, from such characteristics he must

Airplane controls The three primary flight controls are the ailerons, elevator and rudder. Ailerons: The two ailerons, one at the outer trailing edge of each wing, are movable surfaces that control movement

Airfoil Selection By: Bill Husa Recently there has been a rash of activity relating to the selection or design of wing airfoils. In this article, I will attempt to clarify some of the issues associated

International Journal of Mechanical & Mechatronics Engineering IJMME-IJENS Vol:10 No:03 49 Induced Drag Reduction for Modern Aircraft without Increasing the Span of the Wing by Using Winglet Mohammad Ilias

Get to the point!!! Point footwork of Latosa Escrima Author: Marty Odsather Anchorage, Alaska 1 st TG WT / 11 th SG LWS EBMAS To suggest that any martial art could be a success without the use of strong

(Dick Cavin Photo) The Kasper Wing before its first test flight on May 28, 1974. It was rather severely damaged on its first take off attempt (see text) but is presently being rebuilt. Originally a two-place

THE DESIGN OF WING SECTIONS Published in "Radio Control Model News" Issue Number 8 Winter 93 Aerofoil section design has advanced a great deal since great pioneers like Horatio Phillips experimented with

Sponsored By Cadette These activities are from the Leader Guide Book, How to Guide Cadettes Through Breathe. Additional activities were developed exclusively by Girl Scouts - Western Oklahoma to correlate

Basic Concepts Straight and Level This lesson should start with you asking the student what they did in the last lesson, what do they remember, and determining if they have remembered correctly. We must

Acceleration= Force OVER Mass Design Considerations for Water-Bottle Rockets The next few pages are provided to help in the design of your water-bottle rocket. Read through this packet and answer the questions

Aerofoil DEFINITIONS An aerofoil is a device designed to produce more lift (or thrust) than drag when air flows over it. Angle of Attack This is the angle between the chord line of the aerofoil and the

Chapter 8: Magical Illusions and Hot Tricks It isn t hard to imagine where some of these hot tricks and techniques came from. A flier jerks on the line to try and relaunch a downed kite. The kite rolls

THEORY OF GLIDER FLIGHT In 1988 the Soaring Society rewrote the Joy Of Soaring originally written by Carle Conway. I was asked to assist in the rewriting. The following revision is part of what I recommended.

Job Sheet 1 Blade Aerodynamics The rotor is the most important part of a wind turbine. It is through the rotor that the energy of the wind is converted into mechanical energy, which turns the main shaft

Taildragger Technique Rudder Usage There is no mystery involved in the takeoff of a conventional gear aeroplane. There are, however, certain elements of flight that may require the acquisition of new and

AIAA Easily digestible Aerospace Principles revealed for K-12 Students and Educators. These lessons will be sent on a bi-weekly basis and allow grade-level focused learning. - AIAA STEM K-12 Committee.

Breaking the Sound Barrier: The Aerodynamic Breakthroughs that Made It Possible John D. Anderson Jr. Professor Emeritus Department of Aerospace Engineering University of Maryland & Curator for Aerodynamics

1. Introduction This example loads report is intended to be read in conjunction with BCAR Section S and CS-VLA both of which can be downloaded from the LAA webpage, and the excellent book Light Aircraft